Aliphatic polyamide compositions and corresponding mobile electronic device components

Abstract

Described herein are aliphatic polyamide compositions including an aliphatic polyamide, glass fiber and, optionally, one or more additives. It was surprisingly found that aliphatic polyamide compositions containing specifically selected glass fibers had similar dielectric performance, and significantly improved mechanical performance, relative to corresponding aliphatic polyamide compositions containing low dielectric glass fiber. At least partially due to the high dielectric performance (low dielectric constant) and significantly improved mechanical performance, the aliphatic polyamide compositions can be advantageously incorporated into mobile electronic device components.

1 . An aliphatic polyamide composition comprising:
 an aliphatic polyamide polymer and   from about 30 wt. % to about 60 wt. % of glass fiber, relative to the total weight of the polyamide composition,   wherein the glass fiber has:   a dielectric constant at 1 MHz of from 5.1 to 5.5, and   a tensile modulus of from 75 GPa to 100 GPa,   wherein the aliphatic polymer composition has a dielectric constant at 1 MHz of less than 4.   
     
     
         2 . The aliphatic polyamide composition of  claim 1 , comprising from 35 wt. % to 45 wt. % of the glass fiber. 
     
     
         3 . The aliphatic polyamide composition of  claim 1 , wherein the glass fiber has a tensile modulus of from 80 GPa to 95 GPa. 
     
     
         4 . (canceled) 
     
     
         5 . The aliphatic polyamide composition of  claim 1 , wherein the aliphatic polymer composition has a dielectric constant at 2.4 GHz of less than 3.8. 
     
     
         6 . The aliphatic polyamide composition of  claim 1 , wherein the aliphatic polyamide composition has a tensile modulus of at least 10 GPa. 
     
     
         7 . The aliphatic polyamide composition of  claim 1 , further comprising from 0.5 wt. % to 5 wt. % of pigment, dye or colorant selected from the group consisting of TiO 2 , carbon black, zinc sulfide, barium sulfate, zinc oxide, ferric oxide and any combination of one or more thereof, relative to the total weight of the aliphatic polyamide composition. 
     
     
         8 . The aliphatic polyamide composition of  claim 1 , comprising from 40 wt. % to 70 wt. % of the aliphatic polyamide. 
     
     
         9 . (canceled) 
     
     
         10 . The aliphatic polyamide composition of  claim 1 , wherein the aliphatic polyamide composition is free of aromatic polymers and free of cycloaliphatic polymers. 
     
     
         11 . (canceled) 
     
     
         12 . A mobile electronic device component comprising a radio antenna and an aliphatic polyamide composition,
 said aliphatic polyamide composition comprising:   an aliphatic polyamide polymer and   from about 30 wt. % to about 60 wt. % of glass fiber, relative to the total weight of the aliphatic polyamide composition,   wherein the glass fiber has:   a dielectric constant at 1 MHz of from 5.1 to 5.5, and   a tensile modulus of from 75 GPa to 100 GPa.   
     
     
         13 . The mobile electronic device component of  claim 12 , wherein the radio antenna is a WiFi antenna or an RFID antenna. 
     
     
         14 . The mobile electronic device component of claim  claim 12 , wherein the mobile electronic device component is an antenna housing. 
     
     
         15 . The mobile electronic device component of  claim 12 , wherein the mobile electronic device is selected from the group consisting of a mobile phone, a personal digital assistant, a laptop computer, a tablet computer, a wearable computing device, a camera, a portable audio player, a portable radio, a global position system receiver, and a portable game console. 
     
     
         16 . The mobile electronic device component of  claim 12 , wherein the aliphatic polyamide composition comprises from 35 wt. % to 45 wt. % of the glass fiber. 
     
     
         17 . The mobile electronic device component of  claim 12 , wherein the glass fiber has a tensile modulus of from 80 GPa to 95 GPa. 
     
     
         18 . The mobile electronic device component of  claim 12 , wherein the aliphatic polymer composition has a dielectric constant at 1 MHz of less than 4.0. 
     
     
         19 . The mobile electronic device component of  claim 12 , wherein the aliphatic polymer composition has a dielectric constant at 2.4 GHz of less than 3.8. 
     
     
         20 . The mobile electronic device component of  claim 12 , wherein the aliphatic polymer composition has a tensile modulus of at least 10 GPa. 
     
     
         21 . The mobile electronic device component of  claim 12 , wherein the aliphatic polyamide composition further comprises from 0.5 wt. % to 5 wt. % of pigment, dye or colorant selected from the group consisting of TiO 2 , carbon black, zinc sulfide, barium sulfate, zinc oxide, ferric oxide and any combination of one or more thereof, relative to the total weight of the aliphatic polyamide composition. 
     
     
         22 . The mobile electronic device component of  claim 12 , wherein the aliphatic polyamide composition comprises from 40 wt. % to 70 wt. % of the aliphatic polyamide. 
     
     
         23 . The mobile electronic device component of  claim 12 , wherein the aliphatic polyamide composition is free of aromatic polymers and free of cycloaliphatic polymers.